Those Thermionic Series speakers look nothing like a fully hornloaded full range speaker. I mean part of the reason i'm partial to the Klipschorn is that particular sound from a bass horn. The Thermionics look like any off the shelf vented bass reflex enclosure so it would be tough to say they sound even close to a Klipschorn? Seeing how most people have never auditioned them, I suppose you really need to have both the pi-speakers and the Klipschorns side by side to really tell the difference?